That's because the MSD is sucking the life out of the earth on the car. Just shows how bad the wiring on older cars really is.
Yes the RPM counters lose reading. That box will sort it. Think they are about £40.

Don't waste your time with a 6L - Stick to the 6AL with the RPM limiter. How do you know it's real ?
Well, not difficult to me, but maybe for you. Smell it, it should smell 'electronic' and no smell of factory oil. Open the back up; inside should be ALL SEALED with epoxy over most of the components.

You can buy the limiter chips for no money, they just pull in and out.
To change to 4 cylinder, you unscrew that little black cap on the side and snip the two wires....easy.

n2oxide wrote:Sunbeam Lotus owner had same issue last week. Turned out his unit purchased on an internet auction site was a fake......
A lot of 2nd hand ones for sale because the buyers discover they are fake.

Are you sure only the orange and black are to the coil ?

Perry

Hi Perry,

Yes all wired up correctly. What concerned me was that there was no sticker/label on the back of the case but it was an old model with an old original MSD oil filled coil (swapped at MSD for the SS blaster). (came in an authentic vintage box untouched).

I may well end up opening the unit up to check her out (shame they are riveted). No smell of oil.